13. d1d2 And Praggnanandhaa comes with a logical and strong novelty. The center is now overprotected and the rooks are connected. 13... f5e4 Murzin keeps fighting for the center. 14. b5c6 A key resource for White that not only provides enough control over the d4-e5 squares, but which also blocks the remaining black bishop. 14... b7c6 Following the forcing line. 15. e5f6 